The cub as with the other Farmall tractors of the era were built to run and run, and run. As long as it has the proper amount of the correct weight oil, and the rad has coolant in it, you should be just fine.
All that said, there are lots of other things to consider like, does it have good oil pressure? Is the coolant system restricted?
However, if all things are good, running it 8-10 hours straight won't hurt it a bit. Unlike animals that need a rest, or faulty lubrication or cooling systems, a healthy engine is designed to run. Period.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
... [Read Article]
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